Leissa and So presented accurate frequencies for solid cylinders using the Rayleigh–Ritz method for both a completely traction-free solid cylinder and a solid cylinder which is fixed at one end. They compared their frequencies for the traction-free case with my series solution in their Tables VI and VII. The comparison does not demonstrate the accuracy which can be achieved with the series solution. A table demonstrating the convergence of the series solution is presented in this Comment. Discrepancies were found between the Rayleigh–Ritz solutions and the converged series solution for some of the frequencies in Table VI. Further discrepancies were found in some of the other results. All discrepancies are tabulated for the traction-free case.